Sometimes, when creating Master-Detail reports, a part Details (subordinate entries) of the Master-Detail band will be on one page, while another part will be moved to the next page. This may happen due to the fact that all the detailed records will not fit one page. In this case, if it is still necessary to output the Master along with its details on one page, you can use the KeepDetails property. By default, this property is set to false.
The picture above shows a report in what a part of Details is located on one page, while the other part of details has been moved to the next page. If property is set to true, then the report generator will try to place the Master and Detail records on one page. If the report generator cannot do it, the Master and Details together will be moved to the next page.
The picture above shows an example of a report with the KeepDetails property of the Master set to true. If it is not possible to put them together, then the data will be forcibly broken and displayed on different pages. In this case, if the Master component has many Detail records and take a significant part on the page, and the KeepDetails property is set to true, then there may be a large empty space at the bottom of each page.